410 Area Code: Baltimore, Maryland

Maryland's 410 area code covers the eastern half of the state, with Baltimore as the primary city. Baltimore sits at the head of a deep natural harbor on the Patapsco River branch of the Chesapeake Bay, organized around a working port that has anchored the city since colonial times. The local working economy reflects the port, a substantial healthcare and biomedical sector centered on Johns Hopkins, and a long manufacturing history that has reshaped through recent decades. The 410 footprint extends across Annapolis (the state capital), the Eastern Shore counties along the Chesapeake, and the surrounding region of central and eastern Maryland.

In records the directory has compiled for 410 numbers, Germantown — a city in western Maryland — appears regularly despite lying outside the 410 footprint to the west. The pattern reflects standard public-record dynamics, with phone numbers porting across Maryland and addresses linked across multiple cities. The directory currently documents 687 distinct prefixes within 410 in detail, a working subset of the prefix population the code carries.

Baltimore's home values come in below the US median, with median household income running below the national figure. The city's median age sits close to the US reading, and population places Baltimore among the larger cities in the mid-Atlantic — substantial enough to anchor a metropolitan area that pulls steadily on populations from across central and eastern Maryland. The broader 410 footprint reflects a mix of urban Baltimore neighborhoods, suburban Baltimore County, the Annapolis region, and the rural Eastern Shore.